Workshop

Internet Identification
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More than likely, you have one of the following types of Internet access:
• Method 1: Workstation dialup connections only (see Figure 19.1).
Figure 19.1 A workstation dialing up to a typical Internet service provider.
• Method 2: Firewall or proxy direct to ISP (see Figure 19.2).
Figure 19.2 A firewall or proxy server located on your network that’s connected to the ISP.
• Method 3: ISP router only, no firewall (see Figure 19.3).
Figure 19.3 A router connecting a network directly to an ISP and therefore directly to the
Internet (this method is becoming rare due to security concerns).
• Method 4: Firewall or proxy, DMZ (demilitarized zone) network to ISP router (see Figure
19.4).
Figure 19.4 A typical demilitarized zone setup allows for “permissive” access to public access